My method is a little different and may take a little explaining. My setup is such that I can use the traditional ball & cup or the Max Coupler and it takes, maybe 15 min. to switch from one to the other. Of course I have separate receivers for my tow rig. My reasoning is that for highway and Forest Service type roads the ball is entirely adequate. I will switch to the Max when I know the terrain is such that the Max is preferred or required. My reasoning is to avoid unnecessary wear on it. Plus it gives me a backup. So, most places I use the Max are difficult to reach. Where I camp is relatively secluded and that helps keep most thieves away and risk at a minimum. I end up not using any discouragement with the Max when it's connected to my tow rig. With the ball, however, just to discourage theft, I'll use a padlock instead of the normal pin on the cup latch since I'm towing through a higher risk environment.
Under most conditions, all you can do is discourage theft. In the wrong areas and conditions, if the thief wants it bad enough, they'll figure a way. If the area where I camped or the trailer is parked is high risk, I'll remove and store both sides in the locked tongue box. I have a long shanked padlock to install through an empty hitch hole on the frame to give a little additional discouragement.
I start with this:
And choose this most of the time:
Or the Max for the rough stuff (bolts have washers and nuts not shown):
And the padlock instead of the pin:
